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Calculus
A ball is thrown upward from a height of 5 meters with an initial velocity of 20 m/s, so its height is h(t) = -5t² + 20t + 5. At what time does the ball reach its maximum height?
Algebra
The sum of two numbers is 24. Twice the smaller number is 6 more than the larger number. Find both numbers.
Chemistry
Physics
A 3000 kg truck at 50 km/h hits a stationary 1000 kg car,and both stick together. Find their common velocity.
